A2OJ Ladders
This ladder provides a structured path for users with a Codeforces Rating between 1800 to 1899. It has different levels of difficulty, helping them to systematically improve their problem-solving skills. A2OJ ladders have proven to be beneficial for many competitive programmers over the years.
Also known as ACD Ladder 1800–1899, A2OJ Ladder.
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Overall progress
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0/7
Easy
0/23
Medium
0/70
Hard
| Status | Problem | Solve | Practice | Revision | Level | |
|---|---|---|---|---|---|---|
| 1. | Anton and Letters |  | Easy | |||
| 2. | Way Too Long Words | | Easy | |||
| 3. | Young Physicist | | Easy | |||
| 4. | Coder | | Easy | |||
| 5. | Collecting Beats is Fun | | Easy | |||
| 6. | Fox and Cross | | Easy | |||
| 7. | Archer | | Medium | |||
| 8. | Sereja and Suffixes | | Easy | |||
| 9. | Ladder | | Medium | |||
| 10. | Color the Fence | | Medium | |||
| 11. | Vasya and Robot | | Medium | |||
| 12. | Fools and Roads | | Hard | |||
| 13. | Dima and Hares | | Hard | |||
| 14. | Xenia and Weights | | Medium | |||
| 15. | Inna and Dima | | Hard | |||
| 16. | Cows and Sequence | | Medium | |||
| 17. | Psychos in a Line | | Hard | |||
| 18. | Greg and Graph | | Medium | |||
| 19. | Number of Ways | | Medium | |||
| 20. | Working out | | Medium | |||
| 21. | Read Time | | Hard | |||
| 22. | Cow Program | | Medium | |||
| 23. | LCM Challenge | | Medium | |||
| 24. | Bubble Sort Graph | | Medium | |||
| 25. | Beautiful Numbers | | Hard | |||
| 26. | Counting Kangaroos is Fun | | Medium | |||
| 27. | Little Girl and Maximum Sum | | Medium | |||
| 28. | Little Girl and Maximum XOR | | Medium | |||
| 29. | No to Palindromes! | | Medium | |||
| 30. | George and Job | | Medium | |||
| 31. | Matrix | | Medium | |||
| 32. | Round Table Knights | | Medium | |||
| 33. | Caesar's Legions | | Medium | |||
| 34. | Zero Tree | | Hard | |||
| 35. | Maximum Submatrix 2 | | Medium | |||
| 36. | Password | | Medium | |||
| 37. | Book of Evil | | Hard | |||
| 38. | Lucky Tree | | Hard | |||
| 39. | Jzzhu and Cities | | Hard | |||
| 40. | Ciel and Duel | | Hard | |||
| 41. | Array and Operations | | Hard | |||
| 42. | Increase Sequence | | Hard | |||
| 43. | Choosing Capital for Treeland | | Medium | |||
| 44. | Fox and Minimal path | | Hard | |||
| 45. | Kalila and Dimna in the Logging Industry | | Hard | |||
| 46. | Vessels | | Hard | |||
| 47. | Greg and Friends | | Hard | |||
| 48. | Sereja and the Arrangement of Numbers | | Hard | |||
| 49. | Super M | | Hard | |||
| 50. | Count Good Substrings | | Hard | |||
| 51. | Roman and Numbers | | Hard | |||
| 52. | Dima and Bacteria | | Hard | |||
| 53. | Civilization | | Hard | |||
| 54. | Enemy is weak | | Hard | |||
| 55. | Dima and Salad | | Hard | |||
| 56. | Little Elephant and Array | | Hard | |||
| 57. | Prime Number | | Hard | |||
| 58. | Prefixes and Suffixes | | Hard | |||
| 59. | A Lot of Games | | Hard | |||
| 60. | Ciel the Commander | | Hard | |||
| 61. | Painting Fence | | Hard | |||
| 62. | Breaking Good | | Hard | |||
| 63. | Eternal Victory | | Hard | |||
| 64. | XOR on Segment | | Hard | |||
| 65. | Sereja and Subsequences | | Hard | |||
| 66. | Levko and Array | | Hard | |||
| 67. | Gargari and Permutations | | Hard | |||
| 68. | Watching Fireworks is Fun | | Hard | |||
| 69. | Valid Sets | | Hard | |||
| 70. | Pashmak and Parmida's problem | | Hard | |||
| 71. | Maximum Value | | Hard | |||
| 72. | Pashmak and Graph | | Hard | |||
| 73. | Fox and Card Game | | Hard | |||
| 74. | Strip | | Hard | |||
| 75. | Propagating tree | | Hard | |||
| 76. | Sausage Maximization | | Hard | |||
| 77. | Sereja ans Anagrams | | Hard | |||
| 78. | Good Substrings | | Hard | |||
| 79. | Appleman and Tree | | Hard | |||
| 80. | MUH and Cube Walls | | Hard | |||
| 81. | Pair of Numbers | | Hard | |||
| 82. | Sereja and Brackets | | Hard | |||
| 83. | Water Tree | | Hard | |||
| 84. | Antimatter | | Hard | |||
| 85. | LIS of Sequence | | Hard | |||
| 86. | The Maths Lecture | | Hard | |||
| 87. | Number Transformation II | | Hard | |||
| 88. | Fools and Foolproof Roads | | Hard | |||
| 89. | Lucky Queries | | Hard | |||
| 90. | Caisa and Tree | | Hard | |||
| 91. | Valera and Fools | | Hard | |||
| 92. | Blood Cousins | | Hard | |||
| 93. | Information Graph | | Hard | |||
| 94. | Vasya and Beautiful Arrays | | Hard | |||
| 95. | Little Girl and Problem on Trees | | Hard | |||
| 96. | Valera and Queries | | Hard | |||
| 97. | Yaroslav and Divisors | | Hard | |||
| 98. | Shaass the Great | | Hard | |||
| 99. | Tree and Queries | | Hard | |||
| 100. | Xenia and Tree | | Hard |
There is no PDF here, and you do not need one. All 100 problems are listed in full on this page, free and without an account — and unlike a PDF the list remembers what you have ticked off, so you are not re-reading a static file to work out where you stopped. Use your browser's print view if you want it on paper.
Yes — same sheet, different name. It is also known as ACD Ladder 1800–1899, A2OJ Ladder. Whichever name you searched for, this is the tracker for it.
Tick a problem on this page and it stays ticked. Progress saves in your browser straight away with no account, and the counts update per section so you can see which parts of 1800-1899 A2OJ: Ladder you have actually covered. Signing in with Google syncs it across devices.
At roughly 25 minutes a problem — reading it, solving it and writing the approach down — 100 problems is about 42 hours, or 4 weeks at ten hours a week. Treat that as a planning figure rather than a promise; the first pass through an unfamiliar topic is always slower.
Yes, completely, and no account is needed. There is no paid tier and nothing is held back — the sheet itself is by A2OJ Ladders, and this is a free tracker for it.
Finish one. Sheets overlap heavily, so working several in parallel mostly means re-solving the same problems while never completing a full topic sweep. If you are not sure this is the right one for the time you have, the sheet comparison page puts the options side by side with hour estimates.